SB20260731170 - Remote code execution in TeamCity
Published: July 31, 2026 Updated: August 27, 2026
Security Bulletin ID
SB20260731170
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Deserialization of Untrusted Data (CVE-ID: CVE-2026-63077) Exploited
CWE-ID: CWE-502 - Deserialization of Untrusted Data
CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in the agent polling protocol when processing agent polling requests. A remote attacker can send specially crafted protocol data to execute arbitrary code.
Remediation
Install update from vendor's website.